Thinking 3D is an interdisciplinary exploration of the concept of three-dimensionality and its impact on the arts and sciences, co-investigated by Dr Laura Moretti and Daryl Green, culminating in a wide range of exhibitions and events across Oxford in 2019. The Bodleian Treasury exhibition in 2019, Thinking 3D from Leonardo to Present, will present an overview of the entire project, offering a comprehensive understanding of the development of communicating three-dimensional concepts via two-dimensional media. This Byrne-Bussey Marconi Lecture will tell the story of the inception of Thinking 3D via a number of landmark texts which are shaping the narrative and informing the curatorial work on the main exhibition.